QS ALLROUND
Light biomimetics with subtle leading-edge tubercles. Clean trailing edge without serrations. Best L/D ratio in the QS series. The most balanced fin in the catalog. +54% lift and +20% sustained L/D vs FCS M-5.
ALLROUNDvs FCS M-5
Thick NACA 0012 profile with light tubercles. Clean trailing edge without serrations. The best L/D in the QS series — efficiency without sacrificing lift.
| Metric | ALLROUND | FCS M-5 | Improvement |
|---|---|---|---|
| Sustained lift | 199.0 N | 129.3 N | +54% |
| Sustained L/D | 5.38 | 4.48 | +20% |
| Max L/D | 9.10 | 8.06 | +13% |
Specifications
Dimensions and materials
Available sizes
| Size | Base | Height | Volume | Weight |
|---|---|---|---|---|
| S | 510 mm | 507.6 mm | 244 cm³ | 97 g |
| M | 525 mm | 522.6 mm | 293 cm³ | 113 g |
| L | 540 mm | 532.8 mm | 348 cm³ | 134 g |
Scaling factor design with thickness variations. All sizes maintain the NACA 0012 profile.
Balanced biomimetics
The best of both worlds.
Just the right amount of biomimetics. Light tubercles for stall control without the drag penalty of full serrations and microchannels. The formula for the best L/D in the series.
Light tubercles
1.5 mm x 3 cyclesSubtle leading-edge undulations. Just enough to delay stall at high angles without adding drag at cruising speed. The golden mean.
Clean trailing edge
No serrationsThe trailing edge is completely clean. All the efficiency gain is in the lift, with no serrations adding drag. Pure performance optimized for real conditions.
No microchannels
Smooth surfaceSkin friction reduction isn't needed when you already have the best L/D. The surface is completely smooth for maximum laminar flow.
CFD
Validated simulation
k-omega SST turbulence, fine mesh (~3M cells), 4 angles of attack. Fluid: real seawater at 7.5 m/s.
| Angle | Lift (N) | Drag (N) | L/D |
|---|---|---|---|
| 5° | 101.00 | 11.09 | 9.10 |
| 10° | 199.07 | 21.88 | 9.10 |
| 15° | 310.00 | 56.30 | 5.51 |
| 20° | 401.00 | 201.00 | 2.00 |
Materials
High-performance manufacturing
PA-CF (carbon-fiber nylon) with 3K Twill reinforcement and epoxy coating. Standard FCS II system. 134 g of balanced precision.
Best L/D
9.10 max L/D at 5°. The best ratio in the entire QS series. Efficiency and lift in a single product.
Light tubercles
Just 1.5 mm amplitude with 3 cycles. The exact right amount — measured and optimized by NSGA-II. Not too much, not too little.
Balanced weight
134 g in size L. Lighter than the RADICAL, heavier than the SPEED. The exact weight the algorithm determined for optimal performance.